UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 29, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 439	$ 363
Billed receivables, net of allowances of $11 in 2017 and $13 in 2016	776	731
Contracts in process	2,273	2,055
Inventories	392	330
Other current assets	219	218
Total current assets	4,099	3,697
Property, plant and equipment, net	1,145	1,121
Goodwill	6,652	6,560
Identifiable intangible assets	299	238
Other assets	273	249
Total assets	12,468	11,865
Current liabilities:
Accounts payable, trade	425	299
Accrued employment costs	535	516
Accrued expenses	438	375
Advance payments and billings in excess of costs incurred	493	492
Income taxes payable	26	22
Other current liabilities	366	431
Total current liabilities	2,283	2,135
Pension and postretirement benefits	1,143	1,177
Deferred income taxes	259	236
Other liabilities	385	368
Long-term debt	3,329	3,325
Total liabilities	7,399	7,241
Commitments and contingencies (see Note 18)
Shareholders' equity:
Common stock: $.01 par value; 300,000,000 shares authorized, 78,075,652 shares outstanding at September 29, 2017 and 77,232,204 shares outstanding at December 31, 2016	6,458	6,285
Treasury stock (at cost), 82,901,120 shares at September 29, 2017 and 82,385,075 shares at December 31, 2016	(7,315)	(7,224)
Retained earnings	6,429	6,218
Accumulated other comprehensive loss	(573)	(726)
Total shareholders' equity	4,999	4,553
Noncontrolling interests	70	71
Total equity	5,069	4,624
Total liabilities and equity	$ 12,468	$ 11,865